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The current even timekeeping, which computes enabled and running times, uses 3 distinct timestamps to reflect the various event states: OFF (stopped), INACTIVE (enabled) and ACTIVE (running). Furthermore, the update rules are such that even INACTIVE events need their timestamps updated. This is undesirable because we'd like to not touch INACTIVE events if at all possible, this makes event scheduling (much) more expensive than needed. Rewrite the timekeeping to directly use event->state, this greatly simplifies the code and results in only having to update things when we change state, or an up-to-date value is requested (read). Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.